Secemin Wastewater Treatment Plant, Marianów | Secondary Treatment Facility

The Secemin wastewater treatment plant is located in the village of Marianów, within the gmina of Secemin in the Świętokrzyskie Voivodeship of Poland. It serves a small population of 641 residents, reflecting its role as a local municipal facility in a rural area. As a secondary treatment plant, it provides biological treatment to remove organic matter and suspended solids, meeting the standards required under Polish regulations and the EU Urban Waste Water Treatment Directive (91/271/EEC). The plant's designed capacity of 2800 m³ per day indicates it is sized to accommodate future growth or seasonal variations in flow. The treated effluent is discharged into local watercourses that eventually drain into the Pilica River basin, a tributary of the Vistula River. The Vistula flows northward into the Baltic Sea, making this plant part of the broader Baltic Sea catchment area. Proper treatment helps protect downstream aquatic ecosystems and water quality.

The plant discharges into small streams that feed the Pilica River, a major tributary of the Vistula. The Vistula River flows into the Baltic Sea, a semi-enclosed sea sensitive to nutrient pollution. Secondary treatment reduces organic load and nutrients, helping to mitigate eutrophication risks in the Baltic Sea. The surrounding area is predominantly agricultural, so the plant also helps protect local groundwater and surface water from contamination.